
As long as it doesn't originate
in a Russian man's COLON.
The Big Bang Theory Season 8, Episode 22

A COLON calling card, if you will.
The Big Bang Theory Season 6, Episode 9

You didn't say they couldn't pass through
my COLON first.
The Big Bang Theory Season 8, Episode 18

He just went COLON, capital O.
The Big Bang Theory Season 3, Episode 1

Oh, yes. In the world of emoticons,
I was COLON, capital D.
The Big Bang Theory Season 3, Episode 1